Groundshock....with 3:42 gears, and city driving....uphill, both ways..
15 is a stretch. I have an 02 as well and I just replaced my fan clutch tonight. I'm going to fill up tomorrow but something tells me I will re-coop some MPG's based on my butt-dyno. The fan clutch I replaced was the original, I noticed an immediate difference in driveability and was much snappier.
Who knows, if your fan clutch is stock then it's something to consider. The fan would roar in the morning then settle down, but obviously not enough....very quiet now.
I spoke with someone about getting my injectors cleaned out as well, what he said made sense. The nozzle is positioned in just a way that at optimum spray, the fuel atomizes right behind the intake valve. Take a dirty injector then you get a spray along with very small droplets coming out instead of a perfect atomizing mist, but droplets small enough that they will not atomize fully thus commanding more fuel from the ECM..just a big snowball effect.
He said when he dismantles them after been driven for 100K plus, there is always a varnish and when cleaned there is always an increase in MPG because of the improved atomization. Heck I'm willing to try it, he swears by it so what's to lose......only $25 per injector so it will take awhile to get that money back but with fuel where it is pricewise it's almost a no-brainer....I'll be the test mule.
I have the 4:10 gears and no lift, stock size tires and I am averaging 15-16 MPG, 25 miles to work, first 15 is highway with a few lights, last 10 is stop and go, bumber to bumper...but that was with a bad fan clutch. Ride home is 30 miles and all highway but with about 8-10 red lights. On a road trip I can get about 320 miles comfortably if I keep my foot out of it.